abbr.
数字配线架(Digital Distribution Frame);数据库描述文件(Database Definition File);微分分布函数(Differential Distribution Function);开发论证设施(Development Demonstration Facility)
例句
A novel disturbance decoupled filter (DDF) design scheme is presented.
提出一种干扰解耦滤波器(DDF)设计的新方法。
Yes. Your district can allocate a portion of its DDF to help fund PolioPlus and PolioPlus Partners.
可以。贵地区可拨配一部份地区指定基金以资助根除小儿痲痹计划与根除小儿痲痹伙伴计划。
The purpose of the program is to allow districts to use a portion of their DDF for humanitarian purposes.